From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Comparison graph of Indicated Horse Power and Indicated Mean Effective Pressure curves for a Lorraine-Dietrich and a 20 HP engine.
| Identifier | ExFiles\Box 5a\5\ 05-page026 | |
| Date | 25th March 1927 | |
| LORRAINE - DIETRICH & 20 H.P. R.R. COMPARISON. INDICATED HORSE POWER & INDICATED MEAN EFFECTIVE PRESSURE CURVES. Left Y-Axis: INDICATED HORSE POWER. Right Y-Axis: INDICATED MEAN EFFECTIVE PRESSURE (LBS. PER SQ."). X-Axis: R.P.M. OF ENGINE. Curve set 1: LORRAINE I.H.P. I.M.E.P. Curve set 2: 20 H.P. R.R. WITH SAME COMPRESSION RATIO & INDUCTION PIPE DIMENSIONS AS THE LORRAINE (CALCULATED VALUES) I.M.E.P. I.H.P. Curve set 3: I.H.P. 20 H.P. R.R. WITH SAME RATIO OF EXPANSION (STANDARD) I.M.E.P. Curve set 4: STD. 20 H.P. R.R. I.H.P. I.M.E.P. | ||